Is there a way to determine in the mobile version if a song is already in an existing playlist as you add it? If you try to add a song and it's already in the 'same' playlist it will alert you "Add to playlist again? This is already in your playlist". However if you add the song to a different playlist you won't get the alert. So what I would like is a menu option called "Is song in any existing playlist?". Is it possible? Is there a third party tool to do this? (I would find it more helpful if it was part of the Spotify app however.